The "who got to America first" debate always baffles me. Its obvious - the native Americans did (from Siberia, again). ; )
I came across the text from a viking inscribed stone in America the other day (in a book, though!) and it made me chuckle. Essentially it said (in runes) "We arrived here on such-and-such a day. Myself and my friend went to hunt for some food. When we returned everyone had been killed. We're going home now."